You can start with Who's Who - the guide to the country's establishment since 1848. But what's changed?

According to our analysis, the return of the Conservative party to goverment has been accompanied by a resurgence of Old Etonian entrants to Who's Who, which collects biographical info on notable individuals. More Old Etonians entered Who's Who in 2011 than any year since 1997.

The findings also show the resurgence of the UK's elite universities, private schools and members club among the establishment, revealing the glacially slow pace of change at the top levels of the country's elite.

Prime Minister David Cameron and Commons leader Sir George Young attended Eton, as did Oliver Letwin. 222 alumni of Nick Clegg's alma mater, Westminster school, have made their way into the pages of Who's Who.

Key facts include:• 31 of the 1,008 new members of the establishment attended the elite school. In total, 1,225 old Etonians grace the book's pages – only 20 fewer than 18 years before• More than 2,300 people attended the top five public schools – Eton, Charterhouse, Harrow, Rugby School and Marlborough

• Fewer than 2% of all UK students attend Oxford or Cambridge but 32% of entrants to Who's Who in 2011 went to one of the two univeristies• Cambridge, with 5,985 alumni listed, was the dominant university, while Oxford trailed behind with 5,776. By contrast Edinburgh, the third most-listed institution, has just 913 listings• Fewer than one in eight luminaries are female, the proportion of women entering the book has been gradually increasing – from 11% in 1996 to 23% in 2011

We've extracted the key data for you - and you can find lots of it in the spreadsheet below. What can you do with it?